CN103080896A - Reordering access to reduce total seek time on tape media - Google Patents
Reordering access to reduce total seek time on tape media Download PDFInfo
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- 230000008707 rearrangement Effects 0.000 claims description 124
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0659—Command handling arrangements, e.g. command buffers, queues, command scheduling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
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- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0683—Plurality of storage devices
- G06F3/0686—Libraries, e.g. tape libraries, jukebox
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Abstract
A method, system and program are disclosed for reordering User Data Segment (UDS) lists to reduce seek times when accessing data stored on tape media. A host application sends a list of UDSs to a target tape drive and requests the tape drive to reorder the list to improve performance. An ordered list of target User data Segments to retrieve from a target tape media is received. Information about the location of each UDS on the target media is processed to determine its corresponding physical position on the tape media. The resulting physical positions are then processed to generate a reordered UDS list, where the order of the User Data Segments is reordered according to their physical location on the target tape media. The reordered list of User Data Segments is then used to perform seek, reposition and read operations to read User Data Segments from the tape media.
Description
Technical field
The present invention relates to manage to being kept at the access of the data on the tape-shaped medium's, more particularly, relate to the rearrangement of the user data segment (UDS, User Data Segment) in the tabulation is searched the time to reduce UDS.
Background technology
For corresponding form factor, the capacity that is used for the tape-shaped medium's of data storage constantly increases.For example, the intrinsic capacity of LTO (LTO, Linear Tape-Open) the 5th generation medium is 1.5 terabytes (TB).Because the capacity of tape-shaped medium's increases, so its application changes.In the past, tape-shaped medium's is mainly used in data backup and filing.At present, tape-shaped medium's also is used to virtual tape server (VTS), hierarchical storage management (HSM) and such as the file system of long-term file system (LTFS).
The message transmission rate of tape-shaped medium's also constantly increases always.For example, the intrinsic read-write transfer rate of aforementioned LTO the 5th generation tape drive is 140MB/ second.The increase of message transmission rate realizes by the usage data compression method.Yet, be 1 minute for the data search time average of the record of the wall scroll on LTO the 5th generation tape drive.Search the combination of the corresponding reorientation speed of length (800 meters) that long reason of time is LTO the 5th generation tape-shaped medium's and about 10 meter per seconds thereof.Another reason is that tape drive is not generally positively known the actual physical location of target record on tape-shaped medium's.
Although the long time of searching is considered to one of weakness of tape-shaped medium's usually, yet when access wall scroll record or its physical location were positioned at records series on the tape-shaped medium's continuously, the time of searching of growing can't present too much unfavorable.Yet when reading and be positioned at discontinuously target record sequence on the tape-shaped medium's, the long time of searching can present the extra stand-by period.In these cases, need tape drive to reel and the debatching tape-shaped medium's, with the position of search target record.As a result, reading the used time total amount of discontinuous records series can be along with the growth of the number of target record and enlarge markedly.
Summary of the invention
Thereby in first aspect, the invention provides a kind of management to the method for the access that is kept at the data on the tape-shaped medium's, described method comprises: receive from the request of the sorted lists of target tape-shaped medium's retrieve user data section; Determine the physical location of each user data segment on the target tape-shaped medium's; Resequence operation to generate the rearrangement tabulation of user data segment, wherein, according to the physical location of user data segment on the target tape-shaped medium's, to the order rearrangement of user data segment; And start according to the order of user data segment in the rearrangement tabulation from target tape-shaped medium's retrieve user data section.
Preferably, the rearrangement operation is processed by the tape drive that comprises the processing logic of tabulating for the rearrangement that generates user data segment.Preferably, the rearrangement operation is processed by the tape library that comprises the processing logic of tabulating for the rearrangement that generates user data segment.Preferably, the rearrangement operation is processed by the main frame that comprises the processing logic of tabulating for the rearrangement that generates user data segment.Preferably, each user data segment comprises many data records.Preferably, the user data segment tape-shaped medium's position data that is kept in one of following by processing is determined the physical location of user data segment on the target tape-shaped medium's: machine readable catalogue (TD); File mark figure; High resolving power tape catalogue (HRTD); Perhaps virtual HRTD.
In second aspect, a kind of system for managing the access that is kept at the data on the tape-shaped medium's is provided, described system comprises: processor, the data bus that is couple to processor and device, and described device is used for: receive from the request of the sorted lists of target tape-shaped medium's retrieve user data section; Determine the physical location of each user data segment on the target tape-shaped medium's; Resequence operation to generate the rearrangement tabulation of user data segment, wherein, according to the physical location of user data segment on the target tape-shaped medium's, to the order rearrangement of user data segment; And start according to the order of user data segment in the rearrangement tabulation from target tape-shaped medium's retrieve user data section.
Preferably, the rearrangement operation is processed by the tape drive that comprises the processing logic of tabulating for the rearrangement that generates user data segment.Preferably, the rearrangement operation is processed by the tape library that comprises the processing logic of tabulating for the rearrangement that generates user data segment.Preferably, the rearrangement operation is processed by the main frame that comprises the processing logic of tabulating for the rearrangement that generates user data segment.Preferably, each user data segment comprises many data records.Preferably, the user data segment tape-shaped medium's position data that is kept in one of following by processing is determined the physical location of user data segment on the target tape-shaped medium's: machine readable catalogue (TD); File mark figure; High resolving power tape catalogue (HRTD); Perhaps virtual HRTD.
In the third aspect, a kind of computer program that is kept at the computer program code on the computer-readable medium that comprises is provided, when being written into computer system and when computer system is carried out, described computer system is carried out according to the institute of the method for first aspect in steps.
The computer program of the third aspect can computer usable medium form provide, described computer usable medium comprises computer program code, described computer program code comprises computer executable instructions, and described computer executable instructions is configured to: receive from the request of the sorted lists of target tape-shaped medium's retrieve user data section; Determine the physical location of each user data segment on the target tape-shaped medium's; Resequence operation to generate the rearrangement tabulation of user data segment, wherein, according to the physical location of user data segment on the target tape-shaped medium's, to the order rearrangement of user data segment; And start according to the order of user data segment in the rearrangement tabulation from target tape-shaped medium's retrieve user data section.The preferred computer program element of the third aspect is corresponding to the preferred method steps feature of first aspect.Computer usable medium can comprise can be from the server disposition that is positioned at remote location to client computer computer executable instructions.Preferably, computer executable instructions offers the consumer by the ISP on basis as required.
Therefore method, system and the computer usable medium of the time of the searching when rearrangement of the user data segment (UDS) in the tabulation is kept at data on the tape-shaped medium's to reduce access are disclosed.In each embodiment, on the tape drive, realizing user data segment (UDS) tabulation rearrangement module on the tape library or in main frame.In these and other embodiment, UDS tabulation rearrangement module receives will be from the sorted lists of the target user data section of tape-shaped medium's retrieval.Then UDS tabulation rearrangement module carries out alternately with the target tape-shaped medium's, and described target tape-shaped medium's generally comprises machine readable catalogue or the out of Memory relevant with its relation between the respective physical position on the tape-shaped medium's with each record number.Tape-shaped medium's is read by tape drive again, and described tape drive can utilize machine readable catalogue or out of Memory to carry out search operation, then reads corresponding data recording.In each embodiment, tape drive is realized having knowing which tape-shaped medium's comprises the tape library of target user data section.
Then UDS tabulation rearrangement module utilizes machine readable catalogue or out of Memory to come the sorted lists of processing target user data segment, to determine the physical location of each user data segment on tape-shaped medium's.Then UDS tabulation rearrangement module processes consequent physical location to generate the rearrangement tabulation of user data segment, and wherein, the order of user data segment is reordered according to their physical locations on the target tape-shaped medium's.Then UDS tabulation rearrangement module offers the application program that realizes at main frame to the rearrangement of user data segment tabulation, and this application program can be searched, reorientation and read operation, to read user data segment from tape-shaped medium's.
Description of drawings
Below with reference to accompanying drawing, illustrate the preferred embodiments of the present invention, in the accompanying drawing:
Fig. 1 has described wherein can realize illustration client computer of the present invention;
Fig. 2 is the simplified block diagram of user data segment (UDS) the tabulation rearrangement module that realizes at tape drive;
Fig. 3 is the simplified block diagram of the UDS tabulation rearrangement module that realizes at tape library;
Fig. 4 is the simplified block diagram of the UDS tabulation rearrangement module that realizes at main frame;
Fig. 5 is the overview flow chart of the operation of UDS tabulation rearrangement module.
Embodiment
Method, system and the computer usable medium of the time of searching when being used for that user data segment (UDS) tabulation rearrangement is kept at data on the tape-shaped medium's to reduce access are disclosed.Person of skill in the art will appreciate that the present invention can be realized as method, system or computer program.Thereby embodiments of the invention can be used hardware fully, use software (comprising firmware, resident software, microcode etc.) fully, perhaps use the embodiment in conjunction with software and hardware to realize.Here, these each embodiment generally can be called as " circuit ", " module " or " system ".In addition, the present invention can take the form of the computer program on the computer-usable storage medium, and described computer-usable storage medium has the computer usable program code that is included in the described medium.
Can utilize any suitable computing machine to use or computer-readable medium.Computing machine can with or computer-readable medium can be for example (but being not limited to) electricity, magnetic, light, electromagnetism, infrared or semiconductor system, equipment or device.The more specifically example of computer-readable medium (non exhaustive tabulation) can comprise: portable computer disk, hard disk, random access memory (RAM), ROM (read-only memory) (ROM), EPROM (Erasable Programmable Read Only Memory) (EPROM or flash memory), portable compact disc read-only memory (CD-ROM), light storage device or magnetic memory apparatus.In the context of this article, computing machine can with or computer-readable medium can comprise, preserve, transmit or transmit for instruction execution system, equipment or device, perhaps any medium of the program of combined command executive system, equipment or device use.
Available Object-Oriented Programming Language such as Java, Smalltalk, C++ is write the computer program code of carrying out operation of the present invention.Yet also available conventional process programming language such as " C " programming language or similar programming language is write the computer program code of carrying out operation of the present invention.Program code can be fully moves at user's computing machine, part is moved at user's computing machine, as software package independently, part is moved at remote computer in user's computing machine operation and part, perhaps moves at remote computer or server fully.In a rear situation, remote computer can pass through LAN (Local Area Network) (LAN) or wide area network (WAN), is connected to user's computing machine, perhaps can realize and (for example being connected of outer computer, utilize the ISP, realize through the Internet and being connected of outer computer).
Process flow diagram and/or block scheme below with reference to according to method, equipment (system) and the computer program of embodiments of the invention illustrate embodiments of the invention.Understand each square frame of process flow diagram and/or block scheme, and the combination available computers programmed instruction of each square frame in process flow diagram and/or the block scheme is realized.These computer program instructions can be provided for multi-purpose computer, the processor of special purpose computer or other programmable data processing device, thereby the generation machine, so that the instruction of the processor of computer or other programmable data processing device operation produces the device of the function of appointment in the one or more square frames that are implemented in process flow diagram and/or block scheme/action.
These computer program instructions also can be stored in the computer-readable memory, but described computer-readable memory command calculations machine or other programmable data processing device are by the ad hoc fashion operation, so that the instruction that is kept in the computer-readable memory produces manufactured goods, described manufactured goods comprise the command device of the function of appointment in the one or more square frames that are implemented in schematic flow diagram and/or schematic block diagram/action.
Computer program instructions also can be loaded on computing machine or other programmable data processing device, so that carry out a series of operation steps at described computing machine or other programmable device, thereby produce computer implemented processing, so that the instruction of carrying out at described computing machine or other programmable device provides the step of the function of appointment in the one or more square frames that are implemented in process flow diagram and/or block scheme/action.
Fig. 1 is the block scheme that wherein can utilize illustration client computer 102 of the present invention.Client computer 102 comprises the processor 104 that is couple to system bus 106.The video adapter 108 of control display device 110 also is couple to system bus 106.System bus 106 is couple to I/O (I/O) bus 114 through bridge 112.I/O interface 116 is couple to I/O bus 114.I/O interface 116 provides and the communicating by letter of each I/O device, described each I/O device comprises keyboard 118, mouse 120, Compact Disc-Read Only Memory (CD-ROM) driver 122, tape drive 124 (it can comprise one or more tapes, to form tape library) and flash drive 126.The form that is connected to the port of I/O interface 116 can be the arbitrary format known to the skilled of field of computer architecture, includes, but is not limited to USB (universal serial bus) (USB) port.
Client computer 102 can utilize network interface 130, communicates by letter with ISP's server 152 by network 128, and network interface 130 is couple to system bus 106.Network 128 can be the external network such as the Internet, perhaps such as the internal network of ethernet network or VPN (virtual private network) (VPN).
Hard disk drive interface 132 also is couple to system bus 106.Hard disk drive interface 132 is connected with hard disk drive 134.In a preferred embodiment, hard disk drive 134 fill system storeies 136, system storage 136 also is couple to system bus 106.The data of fill system storer 136 comprise operating system (OS) 138 and the software program 144 of client computer 102.
OS138 comprises be used to providing the shell 140 such as transparent user's access of the resource of software program 144.Usually, shell 140 provides the program of the interface between interpreter and user and the operating system.More particularly, shell 140 is carried out and is transfused in the command line user interface or from the order of file.Therefore, shell 140 (
In appellation)
In be also referred to as command processor, the highest level of operating system software level normally, and play command interpreter.Shell provides system prompt, explains the order that utilizes keyboard, mouse or other user to input the medium input, and the order after explaining is sent to the suitable lower-level (for example, kernel 142) of operating system in order to process.Although shell 140 normally text based towards the row user interface, yet the present invention also can support other user interface mode, such as figure, voice, gesture etc.
As mentioned above, OS138 also comprises kernel 142, kernel 142 can comprise the low order function of OS138, comprises the basic service that the other parts of OS138 and software program 144 are required, comprises memory management, process and task management, disk management and mouse and Keyboard management.
Software program 144 can comprise browser 146 and email client 148.Browser 146 comprises makes WWW (WWW) client (namely, client computer 102) can utilize HTML (Hypertext Markup Language) (HTTP) message to transmit with respect to the Internet sending and receiving internet message, thereby can realize the program module of communicating by letter and instruction with ISP's server 152.Software program 144 also comprises user data segment (UDS) tabulation rearrangement module 150.UDS tabulation rearrangement module 150 comprises the code for the processing that is implemented in Fig. 2-4 description that the following describes.In one embodiment, client computer 102 can be downloaded UDS tabulation rearrangement module 150 from ISP's server 152.
It is detailed that the hardware element of describing in client computer 102 is not intended, and only is representational on the contrary, with outstanding assembly used in the present invention.For example, client computer 102 can comprise other memory storage, such as magnetic tape cassette, digital versatile disc (DVD), Bernoulli box etc.These and other changes all within the spirit and scope of the present invention.
What data recording used herein was defined as that (such as from main frame) provide processes and the minimum different pieces of information collection of record for tape drive system etc., and same, can read, again process and make it can be used for for example minimum different pieces of information collection of main frame from tape by tape drive system.In each embodiment, the common write-once of application program of moving at main frame or read one group of many data record (being called as user data segment here).
In these and other embodiment, application program is generally called loading command and is loaded the tape-shaped medium's that comprises a plurality of user data segments.In case tape-shaped medium's is loaded, application program is just called the reorientation order and is searched the target user data section, then calls reading order and reads the target user data section.Then repeat these steps, until read all target user data sections.
Yet before can carrying out search operation, tape drive at first needs the physical location of estimating target data recording.Because tape-shaped medium's may comprise millions of data records, it is originally always unfeasible with it that the physical location of every record is kept at tape-shaped medium's.Similarly, the physical location of data estimator record also is difficult, because every data record may vary in size.As a result, if the physical location of the data recording of estimating away from its physical location, the data recording time of searching can increase so.
In each embodiment, by the deal with data record number and indexed to tape-shaped medium's the predetermined physical scope or the zone other for information about, determine the physical location of target user data section and the associated data record of target user data section.In these and other embodiment, the data recording positional information is stored among machine readable catalogue (TD), file mark figure, high resolving power tape catalogue (HRTD) or the virtual HRTD, other index data record method that perhaps those skilled in the art are afamiliar with.
When tape-shaped medium's was used to data backup or filing, the long time of searching generally was not a problem.In some cases, only read one or several user data segment.In other cases, read more user data segment, but they are tactic at tape-shaped medium's generally, therefore usually cause the time of searching to locate first user data segment.Yet, when tape-shaped medium's is used to virtual tape warehouse (VTS) or file system, usually can read the many user data segments on the tape-shaped medium's.For example, the reclaimer operation that VTS is carried out and can cause reading of many user data segments to the defragmentation operation that file system is carried out.In these cases, the accumulation time of searching that is associated with each search operation is added together, and causes performance to reduce.
In each embodiment, on the tape drive, realizing user data segment (UDS) tabulation rearrangement module on the tape library or in main frame.In these and other embodiment, UDS tabulation rearrangement module receives will be from the sorted lists of the target user data section of tape-shaped medium's retrieval.Then UDS tabulation rearrangement module carries out alternately with the target tape-shaped medium's, and described target tape-shaped medium's generally comprises machine readable catalogue or the out of Memory relevant with its relation between the respective physical position on the tape-shaped medium's with each record number.Tape-shaped medium's is read by tape drive again, and described tape drive can utilize machine readable catalogue or out of Memory to carry out search operation, then reads corresponding data recording.In each embodiment, tape drive is realized having knowing which tape-shaped medium's comprises the tape library of target user data section.
In each embodiment, determine distance (' D') between first user data segment ' A' and the second user data segment ' the B' by utilizing following algorithm:
D=|E(A)-S(B)|/V
In this algorithm, D is the distance between user data segment ' A' and user data segment ' the B', E (X) is beginning to the length of the ending of user data segment X from tape, S (X) is from the beginning to the length of the starting point of user data segment X of tape, and V is the speed that tape-shaped medium's is searched user data segment.
Then UDS tabulation rearrangement module utilizes distance (' the D') information of calculating to come the sorted lists of processing target user data segment, to determine the physical location of each user data segment on tape-shaped medium's.Then UDS tabulation rearrangement module processes consequent physical location, and to generate the rearrangement tabulation of user data segment, wherein, the order of user data segment is reordered according to their physical locations on the target tape-shaped medium's.Then UDS tabulation rearrangement module offers the application program that realizes at main frame to the rearrangement of user data segment tabulation, and this application program can be searched, reorientation and read operation, to read user data segment from tape-shaped medium's.
Fig. 2 is according to embodiments of the invention, the simplified block diagram of user data segment (UDS) the tabulation rearrangement module that realizes at tape drive.In the present embodiment, tape library 206 comprises tape-shaped medium's 210 and tape drive 208, and tape drive 208 comprises again user data segment (UDS) tabulation rearrangement module 250.Main frame 202 comprises application program 204, and application program 204 can carry out being associated with tape library 206, tape drive 208, UDS tabulation rearrangement module 250 and tape-shaped medium's 210 searches, reorientation and read operation.
As described in more detail here, application program 204 offers UDS tabulation rearrangement module 250 to user data segment tabulation 212, and UDS tabulation rearrangement module 250 is determined the physical location of each user data segment on tape-shaped medium's 210.In case determined physical location, UDS tabulation rearrangement module 250 just generates the user data segment tabulation 216 of rearrangement, and then the user data segment tabulation 216 of described rearrangement is provided for application program 204.Then application program utilizes the user data segment tabulation 216 of rearrangement to carry out the reorientation operation, with tape-shaped medium's 210 reorientations 218 to tabulate first user data segment in 216 of the user data segment of rearrangement.Afterwards, application program is carried out read operation, with first user data segment in the user data segment tabulation 216 of reading 220 rearrangements.In case read first user data segment, application program 204 utilizes the user data segment tabulation 216 of rearrangement to carry out reorientation and read operation with regard to continuing, with the remaining users data segment in the user data face tabulation 216 of reading rearrangement.Person of skill in the art will appreciate that, if tape drive 208 does not need tape library 206 or application program 204 are made any change being replaced by New Magnetic Field Controlled tape drive 208 in the future so.
Fig. 3 is according to embodiments of the invention, the simplified block diagram of user data segment (UDS) the tabulation rearrangement module that realizes at tape library.In the present embodiment, tape library 206 comprises tape-shaped medium's 210, tape drive 208, user data segment (UDS) tabulation rearrangement module 350 and machine readable catalogue or other user data segment positional information 314.Main frame 202 comprises application program 204, and application program 204 can carry out being associated with tape library 206, tape drive 208, UDS tabulation rearrangement module 250 and tape-shaped medium's 210 searches, reorientation and read operation.
As described in more detail here, application program 204 offers UDS tabulation rearrangement module 350 to user data segment tabulation 212, and UDS tabulation rearrangement module 350 is determined the physical location of each user data segment on tape-shaped medium's 210.In case determined physical location, UDS tabulation rearrangement module 350 just generates the user data segment tabulation 216 of rearrangement, and then the user data segment tabulation 216 of rearrangement is provided for application program 204.Then application program 204 utilizes the user data segment tabulation 216 of rearrangement to carry out the reorientation operation, with tape-shaped medium's 210 reorientations 218 to tabulate first user data segment in 216 of the user data segment of rearrangement.Afterwards, application program is carried out read operation, with first user data segment in the user data segment tabulation 216 of reading 220 rearrangements.In case read first user data segment, application program 204 utilizes the user data segment tabulation 216 of rearrangement to carry out reorientation and read operation with regard to continuing, with the remaining users data segment in the user data segment tabulation 216 of reading rearrangement.Person of skill in the art will appreciate that if the user data segment of expectation is recorded in a plurality of tape-shaped medium's 210 boxes, present embodiment allows tape library 206 select target tape-shaped medium's 210 so.
Fig. 4 is according to embodiments of the invention, the simplified block diagram of the UDS tabulation rearrangement module that realizes at main frame.In the present embodiment, tape library 206 comprises tape-shaped medium's 210 and tape drive 208.Main frame 202 comprises user data segment (UDS) tabulation rearrangement module 450, user data segment tabulation 412 and application program 204, and application program 204 can carry out being associated with tape library 206, tape drive 208, UDS tabulation rearrangement module 250 and tape-shaped medium's 210 searches, reorientation and read operation.
In the present embodiment, application program 204 receives machine readable catalogue, tape drive and tape-shaped medium's information 412 from tape library 206 or tape drive 208.Then UDS tabulation rearrangement module 450 utilizes machine readable catalogue, tape drive and tape-shaped medium's information 412 to determine the physical location of each user data segment on tape-shaped medium's 210.In case determined physical location, the then processes user data section tabulation 412 of UDS tabulation rearrangement module 450, to generate the user data segment tabulation 416 of rearrangement, then the user data segment tabulation 416 of rearrangement is provided for application program 204.Then application program utilizes the user data segment tabulation 416 of rearrangement to carry out the reorientation operation, with tape-shaped medium's 210 reorientations 218 to tabulate first user data segment in 216 of the user data segment of rearrangement.Afterwards, application program is carried out read operation, with first user data segment in the user data segment tabulation 216 of reading 220 rearrangements.In case read first user data segment, application program 204 utilizes the user data segment tabulation 216 of rearrangement to carry out reorientation and read operation with regard to continuing, with the remaining users data segment in the user data segment tabulation 216 of reading rearrangement.
Fig. 5 is the overview flow chart according to the operation of user data segment (UDS) the tabulation rearrangement module of embodiments of the invention realization.In the present embodiment, beginning UDS tabulation rearrangement operation in step 502 in step 504, determines whether to have realized UDS tabulation rearrangement module at the target tape drive afterwards.If so, so as described in more detail here, in step 506, application program is submitted to UDS tabulation rearrangement module on the tape drive to target UDS tabulation.Otherwise, in step 508, determine whether at the target tape library and realized UDS tabulation rearrangement module.If so, so as described in more detail here, in step 510, application program offers UDS tabulation rearrangement module on the tape library to target UDS tabulation.In case UDS is submitted to respectively UDS tabulation rearrangement module in step 506 or step 510, UDS tabulation rearrangement module just reads the machine readable catalogue of destination media in step 512.
Yet, if in step 508, determine not realize UDS tabulation rearrangement module at tape library, in step 514, determine whether so to have realized UDS tabulation rearrangement module at main frame.If not, finish UDS tabulation rearrangement operation in step 532 so.Otherwise UDS tabulation rearrangement module is from the target tape drive or from the retrieval of target tape library machine readable catalogue, tape drive and tape-shaped medium's information.Afterwards, in case perhaps UDS tabulation rearrangement module has read the machine readable catalogue of destination media in step 512, UDS tabulation rearrangement module is the physical location information that is associated of each UDS definite in step 518 and on the tape-shaped medium's just.
Afterwards, UDS tabulation rearrangement module is processed physical location information to generate the UDS tabulation of rearrangement in step 520, and then in step 522, the UDS of rearrangement tabulation is submitted to application program.Application program is carried out search operation again in step 524, with the position of first UDS in the UDS tabulation that destination media is positioned at rearrangement.Afterwards, application program is carried out read operation to read target UDS.Then determined whether to read last UDS in the UDS tabulation of rearrangement in step 528.If so, in step 532, finish so UDS tabulation rearrangement operation.Otherwise in step 530, application program is carried out search operation, with the physical location of the next UDS in the UDS tabulation that tape-shaped medium's is positioned at rearrangement.Then by proceeding step 526, continue this processing.
Although describe the present invention in detail, yet to one skilled in the art, obviously can make various variations, replacement and transformation to it, and not break away from the scope of the present invention that is limited by accessory claim.
Claims (13)
1. one kind is used for management to the method for the access that is kept at the data on the tape-shaped medium's, and described method comprises:
Reception is from the request of the sorted lists of target tape-shaped medium's retrieve user data section;
Determine the physical location of each user data segment on the target tape-shaped medium's;
Resequence operation to generate the rearrangement tabulation of user data segment, wherein, according to the physical location of user data segment on the target tape-shaped medium's, to the order rearrangement of user data segment; And
Startup according to the order of user data segment in rearrangement tabulation from target tape-shaped medium's retrieve user data section.
2. in accordance with the method for claim 1, wherein, the rearrangement operation is processed by the tape drive that comprises the processing logic of tabulating for the rearrangement that generates user data segment.
3. according to claim 1 or 2 described methods, wherein, the rearrangement operation is processed by the tape library that comprises the processing logic of tabulating for the rearrangement that generates user data segment.
4. according to the described method of any aforementioned claim, wherein, the rearrangement operation is processed by the main frame that comprises the processing logic of tabulating for the rearrangement that generates user data segment.
5. according to the described method of any aforementioned claim, wherein, each user data segment comprises many data records.
6. according to the described method of any aforementioned claim, wherein, determine the physical location of user data segment on the target tape-shaped medium's by the user data segment tape-shaped medium's position data that processing is kept in one of following:
Machine readable catalogue (TD);
File mark figure;
High resolving power tape catalogue (HRTD); Perhaps
Virtual HRTD.
7. one kind is used for management to the system of the access that is kept at the data on the tape-shaped medium's, and described system comprises:
Processor;
Be couple to the data bus of processor; And device, described device is used for:
Reception is from the request of the sorted lists of target tape-shaped medium's retrieve user data section;
Determine the physical location of each user data segment on the target tape-shaped medium's;
Resequence operation to generate the rearrangement tabulation of user data segment, wherein, according to the physical location of user data segment on the target tape-shaped medium's, to the order rearrangement of user data segment; And
Startup according to the order of user data segment in rearrangement tabulation from target tape-shaped medium's retrieve user data section.
8. according to system claimed in claim 7, wherein, the rearrangement operation is processed by the tape drive that comprises the processing logic of tabulating for the rearrangement that generates user data segment.
9. according to claim 7 or 8 described systems, wherein, the rearrangement operation is processed by the tape library that comprises the processing logic of tabulating for the rearrangement that generates user data segment.
10. according to one of any described system of claim 7-9, wherein, the rearrangement operation is processed by the main frame that comprises for the processing logic of the rearrangement tabulation that generates user data segment.
11. according to one of any described system of claim 7-10, wherein, each user data segment comprises many data records.
12. according to one of any described system of claim 7-11, wherein, determine the physical location of user data segment on the target tape-shaped medium's by the user data segment tape-shaped medium's position data that processing is kept in one of following:
Machine readable catalogue (TD);
File mark figure;
High resolving power tape catalogue (HRTD); Perhaps
Virtual HRTD.
13. one kind comprises the computer program that is kept at the computer program code on the computer-readable medium, when being written into computer system and when computer system is carried out, described computer system is carried out according to the institute of one of any described method of claim 1-6 in steps.
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| US12/862,198 US9021175B2 (en) | 2010-08-24 | 2010-08-24 | Method for reordering access to reduce total seek time on tape media |
| US12/862,198 | 2010-08-24 | ||
| PCT/EP2011/064389 WO2012025492A1 (en) | 2010-08-24 | 2011-08-22 | Reordering access to reduce total seek time on tape media |
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| CN103080896A true CN103080896A (en) | 2013-05-01 |
| CN103080896B CN103080896B (en) | 2016-01-13 |
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| US (1) | US9021175B2 (en) |
| JP (1) | JP5963314B2 (en) |
| CN (1) | CN103080896B (en) |
| DE (1) | DE112011102076B4 (en) |
| GB (1) | GB2497022A (en) |
| WO (1) | WO2012025492A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US9021175B2 (en) | 2015-04-28 |
| CN103080896B (en) | 2016-01-13 |
| DE112011102076B4 (en) | 2022-09-22 |
| WO2012025492A1 (en) | 2012-03-01 |
| DE112011102076T5 (en) | 2013-03-28 |
| US20120054428A1 (en) | 2012-03-01 |
| GB2497022A (en) | 2013-05-29 |
| JP2013538399A (en) | 2013-10-10 |
| JP5963314B2 (en) | 2016-08-03 |
| GB201303641D0 (en) | 2013-04-17 |
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